小编Bre*_*ney的帖子

function isPdfMimeTypeSupported() {
  if (navigator.mimeTypes != null && navigator.mimeTypes.length > 0)
    for (i = 0; i < navigator.mimeTypes.length; i++) {
      var mtype = navigator.mimeTypes[i];
      if (mtype.type == "application/pdf" && mtype.enabledPlugin)
        return true;
    }
  return false;
}